/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.slider.test

import groovy.json.JsonOutput
import groovy.transform.CompileStatic
import groovy.util.logging.Slf4j
import org.apache.commons.httpclient.HttpClient
import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager
import org.apache.commons.httpclient.methods.GetMethod
import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs.FileStatus
import org.apache.hadoop.fs.FileSystem as HadoopFS
import org.apache.hadoop.fs.Path
import org.apache.hadoop.util.Shell
import org.apache.hadoop.yarn.api.records.ApplicationReport
import org.apache.hadoop.yarn.conf.YarnConfiguration
import org.apache.hadoop.registry.client.types.ServiceRecord
import org.apache.slider.api.ClusterDescription
import org.apache.slider.api.ClusterNode
import org.apache.slider.api.RoleKeys
import org.apache.slider.client.SliderClient
import org.apache.slider.common.params.Arguments
import org.apache.slider.common.tools.Duration
import org.apache.slider.common.tools.SliderUtils
import org.apache.slider.core.conf.AggregateConf
import org.apache.slider.core.exceptions.BadClusterStateException
import org.apache.slider.core.exceptions.SliderException
import org.apache.slider.core.exceptions.WaitTimeoutException
import org.apache.slider.core.main.ServiceLaunchException
import org.apache.slider.core.main.ServiceLauncher
import org.apache.slider.core.registry.docstore.PublishedConfigSet
import org.junit.Assert
import org.junit.Assume

import static Arguments.ARG_OPTION

/**
 * Static utils for tests in this package and in other test projects.
 * 
 * It is designed to work with mini clusters as well as remote ones
 * 
 * This class is not final and may be extended for test cases.
 * 
 * Some of these methods are derived from the SwiftUtils and SwiftTestUtils
 * classes -replicated here so that they are available in Hadoop-2.0 code
 */
@Slf4j
@CompileStatic
class SliderTestUtils extends Assert {
  public static final String DEFAULT_SLIDER_CLIENT = SliderClient.class.name
  static String sliderClientClassName = DEFAULT_SLIDER_CLIENT

  public static void describe(String s) {
    log.info("");
    log.info("===============================");
    log.info(s);
    log.info("===============================");
    log.info("");
  }

  public static String prettyPrint(String json) {
    JsonOutput.prettyPrint(json)
  }

  public static void skip(String message) {
    log.warn("Skipping test: {}", message)
    Assume.assumeTrue(message, false);
  }

  public static void assume(boolean condition, String message) {
    if (!condition) {
      skip(message)
    }
  }

  /**
   * Equality size for a list
   * @param left
   * @param right
   */
  public static void assertListEquals(List left, List right) {
    String lval = collectionToString(left)
    String rval = collectionToString(right)
    String text = "comparing $lval to $rval"
    assertEquals(text, left.size(), right.size())
    for (int i = 0; i < left.size(); i++) {
      assertEquals(text, left[i], right[i])
    }
  }

  /**
   * Assert a list has a given length
   * @param list list
   * @param size size to have
   */
  public static void assertListLength(List list, int size) {
    String lval = collectionToString(list)
    assertEquals(lval, size, list.size())
  }

  /**
   * Stringify a collection with [ ] at either end
   * @param collection collection
   * @return string value
   */
  public static String collectionToString(List collection) {
    return "[" + SliderUtils.join(collection, ", ", false) + "]"
  }

  /**
   * Assume that a string option is set and not equal to ""
   * @param conf configuration file
   * @param key key to look for
   */
  public static void assumeStringOptionSet(Configuration conf, String key) {
    if (!conf.getTrimmed(key)) {
      skip("Configuration key $key not set")
    }
  }

  /**
   * assert that a string option is set and not equal to ""
   * @param conf configuration file
   * @param key key to look for
   */
  public static void assertStringOptionSet(Configuration conf, String key) {
    getRequiredConfOption(conf, key)
  }

  /**
   * Assume that a boolean option is set and true.
   * Unset or false triggers a test skip
   * @param conf configuration file
   * @param key key to look for
   */
  public static void assumeBoolOptionTrue(Configuration conf, String key) {
    assumeBoolOption(conf, key, false)
  }

  /**
   * Assume that a boolean option is true.
   * False triggers a test skip
   * @param conf configuration file
   * @param key key to look for
   * @param defval default value if the property is not defined
   */
  public static void assumeBoolOption(
      Configuration conf, String key, boolean defval) {
    assume(conf.getBoolean(key, defval),
        "Configuration key $key is false")
  }

  /**
   * Get a required config option (trimmed, incidentally).
   * Test will fail if not set
   * @param conf configuration
   * @param key key
   * @return the string
   */
  public static String getRequiredConfOption(Configuration conf, String key) {
    String val = conf.getTrimmed(key)
    if (!val) {
      fail("Missing configuration option $key")
    }
    return val;
  }

  /**
   * Fails a test because required behavior has not been implemented.
   */
  public static void failNotImplemented() {
    fail("Not implemented")
  }


  /**
   * Assert that any needed libraries being present. On Unix none are needed;
   * on windows they must be present
   */
  public static void assertNativeLibrariesPresent() {
    String errorText = SliderUtils.checkForRequiredNativeLibraries()
    if (errorText != "") {
      fail(errorText)
    }
  }

  /**
   * Wait for the cluster live; fail if it isn't within the (standard) timeout
   * @param sliderClient client
   * @return the app report of the live cluster
   */
  public static ApplicationReport waitForClusterLive(
      SliderClient sliderClient,
      int goLiveTime) {
    ApplicationReport report = sliderClient.monitorAppToRunning(
        new Duration(goLiveTime));
    assertNotNull(
        "Cluster did not go live in the time $goLiveTime",
        report);
    return report;
  }

  protected static String[] toArray(List<Object> args) {
    String[] converted = new String[args.size()];
    for (int i = 0; i < args.size(); i++) {
      def elt = args.get(i)
      assert args.get(i) != null
      converted[i] = elt.toString();
    }
    return converted;
  }

  public static void waitWhileClusterLive(SliderClient client, int timeout) {
    Duration duration = new Duration(timeout);
    duration.start()
    while (client.actionExists(client.deployedClusterName, true) &&
           !duration.limitExceeded) {
      sleep(1000);
    }
    if (duration.limitExceeded) {
      fail("Cluster ${client.deployedClusterName} still live after $timeout ms")
    }
  }

  public static void waitUntilClusterLive(SliderClient client, int timeout) {
    Duration duration = new Duration(timeout);
    duration.start()
    while (0 != client.actionExists(client.deployedClusterName, true) &&
           !duration.limitExceeded) {
      sleep(1000);
    }
    if (duration.limitExceeded) {
      fail("Cluster ${client.deployedClusterName} not live after $timeout ms")
    }
  }

  /**
   * Spin waiting for the Slider role count to match expected
   * @param client client
   * @param role role to look for
   * @param desiredCount RS count
   * @param timeout timeout
   */
  public static ClusterDescription waitForRoleCount(
      SliderClient client,
      String role,
      int desiredCount,
      int timeout) {
    return waitForRoleCount(client, [(role): desiredCount], timeout)
  }

  /**
   * Spin waiting for the Slider role count to match expected
   * @param client client
   * @param roles map of roles to look for
   * @param desiredCount RS count
   * @param timeout timeout
   */
  public static ClusterDescription waitForRoleCount(
      SliderClient client,
      Map<String, Integer> roles,
      int timeout,
      String operation = "startup") {
    String clustername = client.deployedClusterName;
    ClusterDescription status = null
    Duration duration = new Duration(timeout);
    duration.start()
    boolean roleCountFound = false;
    while (!roleCountFound) {
      StringBuilder details = new StringBuilder()

      boolean timedOut = duration.limitExceeded
      try {
        status = client.getClusterDescription(clustername)
        roleCountFound = true;
        for (Map.Entry<String, Integer> entry : roles.entrySet()) {
          String role = entry.key
          int desiredCount = entry.value
          List<String> instances = status.instances[role]
          int instanceCount = instances != null ? instances.size() : 0;
          if (instanceCount != desiredCount) {
            roleCountFound = false;
          }
          details.append("[$role]: desired: $desiredCount;" +
                         " actual: $instanceCount ")

          // call out requested count, as this is a cause of problems on
          // overloaded functional test clusters
          def requested = status.roles[role][RoleKeys.ROLE_REQUESTED_INSTANCES]
          if (requested != "0") {
            details.append("requested: $requested ")
          }
        }
        if (roleCountFound) {
          //successful
          log.info("$operation: role count as desired: $details")
          break;
        }
      } catch (BadClusterStateException e) {
        // cluster not live yet; ignore or rethrow
        if (timedOut) {
          throw e;
        }
        details.append(e.toString());
      }
      if (timedOut) {
        duration.finish();
        describe("$operation: role count not met after $duration: $details")
        log.info(prettyPrint(status.toJsonString()))
        fail("$operation: role counts not met after $duration: " +
             details.toString() +
             " in \n$status ")
      }
      log.debug("Waiting: " + details)
      Thread.sleep(1000)
    }
    return status
  }

  /**
   * Wait for the hbase master to be live (or past it in the lifecycle)
   * @param clustername cluster
   * @param spintime time to wait
   * @return true if the cluster came out of the sleep time live 
   * @throws IOException
   * @throws SliderException
   */
  public static boolean spinForClusterStartup(
      SliderClient client,
      long spintime,
      String role)
  throws WaitTimeoutException, IOException, SliderException {
    int state = client.waitForRoleInstanceLive(role, spintime);
    return state == ClusterDescription.STATE_LIVE;
  }

  public static ClusterDescription dumpClusterStatus(
      SliderClient client,
      String text) {
    ClusterDescription status = client.clusterDescription;
    dumpClusterDescription(text, status)
    return status;
  }

  public static List<ClusterNode> listNodesInRole(
      SliderClient client,
      String role) {
    return client.listClusterNodesInRole(role)
  }

  public static void dumpClusterDescription(
      String text,
      ClusterDescription status) {
    describe(text)
    log.info(prettyPrint(status.toJsonString()))
  }


  public static void dumpClusterDescription(String text, AggregateConf status) {
    describe(text)
    log.info(status.toString())
  }

  /**
   * Fetch the current site config from the Slider AM, from the 
   * <code>clientProperties</code> field of the ClusterDescription
   * @param client client
   * @param clustername name of the cluster
   * @return the site config
   */
  public static Configuration fetchClientSiteConfig(SliderClient client) {
    ClusterDescription status = client.clusterDescription;
    Configuration siteConf = new Configuration(false)
    status.clientProperties.each { String key, String val ->
      siteConf.set(key, val, "slider cluster");
    }
    return siteConf;
  }

  /**
   * Fetch a web page
   * @param url URL
   * @return the response body
   */

  public static String GET(URL url) {
    return fetchWebPageWithoutError(url.toString())
  }

  public static String GET(URL url, String path) {
    return GET(url.toString(), path)
  }

  public static String GET(String base, String path) {
    String s = appendToURL(base, path)
    return GET(s)

  }

  def static String GET(String s) {
    return fetchWebPageWithoutError(s)
  }

  public static String appendToURL(String base, String path) {
    return SliderUtils.appendToURL(base, path)
  }

  public static String appendToURL(String base, String... paths) {
    return SliderUtils.appendToURL(base, paths)
  }

  /**
   * Fetch a web page 
   * @param url URL
   * @return the response body
   */

  public static String fetchWebPage(String url) {
    log.info("GET $url")
    def httpclient = new HttpClient(new MultiThreadedHttpConnectionManager());
    httpclient.httpConnectionManager.params.connectionTimeout = 10000;
    GetMethod get = new GetMethod(url);

    get.followRedirects = true;
    int resultCode
    try {
      resultCode = httpclient.executeMethod(get);
      if (resultCode != 200) {
        log.warn("Result code of $resultCode")
      }
    } catch (IOException e) {
      log.error("Failed on $url: $e", e)
      throw e;
    }
    String body = get.responseBodyAsString;
    return body;
  }

  /**
   * Fetches a web page asserting that the response code is between 200 and 400.
   * Will error on 400 and 500 series response codes and let 200 and 300 through. 
   * @param url
   * @return
   */
  public static String fetchWebPageWithoutError(String url) {
    assert null != url

    log.info("Fetching HTTP content at " + url);

    def client = new HttpClient(new MultiThreadedHttpConnectionManager());
    client.httpConnectionManager.params.connectionTimeout = 10000;
    GetMethod get = new GetMethod(url);

    get.followRedirects = true;
    int resultCode = client.executeMethod(get);

    def body = get.responseBodyAsString
    if (!(resultCode >= 200 && resultCode < 400)) {
      def message = "Request to $url failed with exit code $resultCode, body length ${body?.length()}:\n$body"
      log.error(message)
      fail(message)
    }
    return body;
  }

  /**
   * Assert that a service operation succeeded
   * @param service service
   */
  public static void assertSucceeded(ServiceLauncher service) {
    assert 0 == service.serviceExitCode;
  }

  public static void assertContainersLive(ClusterDescription clusterDescription,
      String component, int expected) {
    log.info("Asserting component $component expected count $expected}",)
    int actual = extractLiveContainerCount(clusterDescription, component)
    if (expected != actual) {
      log.warn(
          "$component actual=$actual, expected $expected in \n$clusterDescription")
    }
    assert expected == actual
  }

  /**
   * Robust extraction of live container count
   * @param clusterDescription status
   * @param component component to resolve
   * @return the number of containers live.
   */
  public static int extractLiveContainerCount(
      ClusterDescription clusterDescription,
      String component) {
    def instances = clusterDescription?.instances?.get(component)
    int actual = instances != null ? instances.size() : 0
    return actual
  }

  /**
   * Execute a closure, assert it fails with a given exit code and text
   * @param exitCode exit code
   * @param text text (can be "")
   * @param action action
   * @return
   */
  def assertFailsWithException(int exitCode,
      String text,
      Closure action) {
    try {
      action()
      fail("Operation was expected to fail —but it succeeded")
    } catch (ServiceLaunchException e) {
      assertExceptionDetails(e, exitCode, text)
    }
  }
  
  /**
   * Execute a closure, assert it fails with a given exit code and text
   * @param exitCode exit code
   * @param text text (can be "")
   * @param action action
   * @return
   */
  def assertFailsWithExceptionClass(Class clazz,
      String text,
      Closure action) {
    try {
      action()
      fail("Operation was expected to fail —but it succeeded")
    } catch (Exception e) {
      assertExceptionDetails(e, clazz, text)
    }
  }

  /**
   * Make an assertion about the exit code of an exception
   * @param ex exception
   * @param exitCode exit code
   * @param text error text to look for in the exception
   */
  static void assertExceptionDetails(
      ServiceLaunchException ex,
      int exitCode,
      String text = "") {
    if (exitCode != ex.exitCode) {
      log.warn(
          "Wrong exit code, expected $exitCode but got $ex.exitCode in $ex",
          ex)
      assert exitCode == ex.exitCode
    }
    if (text) {
      if (!(ex.toString().contains(text))) {
        log.warn("String match for \"${text}\"failed in $ex", ex)
        assert ex.toString().contains(text);
      }
    }
  }
  /**
   * Make an assertion about the exit code of an exception
   * @param ex exception
   * @param exitCode exit code
   * @param text error text to look for in the exception
   */
  static void assertExceptionDetails(
      Exception ex,
      Class clazz,
      String text = "") {
    if (ex.class != clazz) {
      throw ex;
    }
    if (text && !(ex.toString().contains(text))) {
      throw ex;
    }
  }

  /**
   * Launch the slider client with the specific args; no validation
   * of return code takes place
   * @param conf configuration
   * @param args arg list
   * @return the return code
   */
  protected static ServiceLauncher<SliderClient> execSliderCommand(
      Configuration conf,
      List args) {
    ServiceLauncher<SliderClient> serviceLauncher =
        new ServiceLauncher<SliderClient>(sliderClientClassName);

    log.debug("slider ${SliderUtils.join(args, " ", false)}")
    serviceLauncher.launchService(conf,
        toArray(args),
        false);
    return serviceLauncher
  }

  public static ServiceLauncher launch(Class serviceClass,
      Configuration conf,
      List<Object> args) throws
      Throwable {
    ServiceLauncher serviceLauncher =
        new ServiceLauncher(serviceClass.name);
    log.debug("slider ${SliderUtils.join(args, " ", false)}")

    serviceLauncher.launchService(conf,
        toArray(args),
        false);
    return serviceLauncher;
  }

  public static Throwable launchExpectingException(Class serviceClass,
      Configuration conf,
      String expectedText,
      List args)
  throws Throwable {
    try {
      ServiceLauncher launch = launch(serviceClass, conf, args);
      throw new AssertionError(
          "Expected an exception with text containing " + expectedText
              + " -but the service completed with exit code "
              + launch.serviceExitCode);
    } catch (Throwable thrown) {
      if (expectedText && !thrown.toString().contains(expectedText)) {
        //not the right exception -rethrow
        log.warn("Caught Exception did not contain expected text" +
                 "\"" + expectedText + "\"")
        throw thrown;
      }
      return thrown;
    }
  }


  public static ServiceLauncher<SliderClient> launchClientAgainstRM(
      String address,
      List args,
      Configuration conf) {
    assert address != null
    log.info("Connecting to rm at ${address}")
    if (!args.contains(Arguments.ARG_MANAGER)) {
      args += [Arguments.ARG_MANAGER, address]
    }
    ServiceLauncher<SliderClient> launcher = execSliderCommand(conf, args)
    return launcher
  }

  /**
   * Add a configuration parameter as a cluster configuration option
   * @param extraArgs extra arguments
   * @param conf config
   * @param option option
   */
  public static void addClusterConfigOption(
      List<String> extraArgs,
      YarnConfiguration conf,
      String option) {

    conf.getTrimmed(option);
    extraArgs << ARG_OPTION << option << getRequiredConfOption(conf, option)

  }

  /**
   * Assert that a path refers to a directory
   * @param fs filesystem
   * @param path path of the directory
   * @throws IOException on File IO problems
   */
  public static void assertIsDirectory(HadoopFS fs,
      Path path) throws IOException {
    FileStatus fileStatus = fs.getFileStatus(path);
    assertIsDirectory(fileStatus);
  }

  /**
   * Assert that a path refers to a directory
   * @param fileStatus stats to check
   */
  public static void assertIsDirectory(FileStatus fileStatus) {
    assertTrue("Should be a dir -but isn't: " + fileStatus,
        fileStatus.isDirectory());
  }

  /**
   * Assert that a path exists -but make no assertions as to the
   * type of that entry
   *
   * @param fileSystem filesystem to examine
   * @param message message to include in the assertion failure message
   * @param path path in the filesystem
   * @throws IOException IO problems
   */
  public static void assertPathExists(
      HadoopFS fileSystem,
      String message,
      Path path) throws IOException {
    if (!fileSystem.exists(path)) {
      //failure, report it
      fail(
          message + ": not found \"" + path + "\" in " + path.getParent() +
          "-" +
          ls(fileSystem, path.getParent()));
    }
  }

  /**
   * Assert that a path does not exist
   *
   * @param fileSystem filesystem to examine
   * @param message message to include in the assertion failure message
   * @param path path in the filesystem
   * @throws IOException IO problems
   */
  public static void assertPathDoesNotExist(
      HadoopFS fileSystem,
      String message,
      Path path) throws IOException {
    try {
      FileStatus status = fileSystem.getFileStatus(path);
      // a status back implies there is a file here
      fail(message + ": unexpectedly found " + path + " as  " + status);
    } catch (FileNotFoundException expected) {
      //this is expected

    }
  }

  /**
   * Assert that a FileSystem.listStatus on a dir finds the subdir/child entry
   * @param fs filesystem
   * @param dir directory to scan
   * @param subdir full path to look for
   * @throws IOException IO probles
   */
  public static void assertListStatusFinds(HadoopFS fs,
      Path dir,
      Path subdir) throws IOException {
    FileStatus[] stats = fs.listStatus(dir);
    boolean found = false;
    StringBuilder builder = new StringBuilder();
    for (FileStatus stat : stats) {
      builder.append(stat.toString()).append('\n');
      if (stat.getPath().equals(subdir)) {
        found = true;
      }
    }
    assertTrue("Path " + subdir
        + " not found in directory " + dir + ":" + builder,
        found);
  }

  /**
   * List a a path to string
   * @param fileSystem filesystem
   * @param path directory
   * @return a listing of the filestatuses of elements in the directory, one
   * to a line, precedeed by the full path of the directory
   * @throws IOException connectivity problems
   */
  public static String ls(HadoopFS fileSystem, Path path)
  throws
      IOException {
    if (path == null) {
      //surfaces when someone calls getParent() on something at the top of the path
      return "/";
    }
    FileStatus[] stats;
    String pathtext = "ls " + path;
    try {
      stats = fileSystem.listStatus(path);
    } catch (FileNotFoundException e) {
      return pathtext + " -file not found";
    } catch (IOException e) {
      return pathtext + " -failed: " + e;
    }
    return pathtext + fileStatsToString(stats, "\n");
  }

  /**
   * Take an array of filestats and convert to a string (prefixed w/ a [01] counter
   * @param stats array of stats
   * @param separator separator after every entry
   * @return a stringified set
   */
  public static String fileStatsToString(FileStatus[] stats, String separator) {
    StringBuilder buf = new StringBuilder(stats.length * 128);
    for (int i = 0; i < stats.length; i++) {
      buf.append(String.format("[%02d] %s", i, stats[i])).append(separator);
    }
    return buf.toString();
  }

  public static void waitWhileClusterLive(SliderClient sliderClient) {
    waitWhileClusterLive(sliderClient, 30000)
  }

  public static void dumpRegistryInstances(
      Map<String, ServiceRecord> instances) {
    describe "service registry slider instances"
    instances.each { Map.Entry<String, ServiceRecord> it ->
      log.info(" $it.key : $it.value")
    }
    describe "end list service registry slider instances"
  }


  public static void dumpRegistryInstanceIDs(List<String> instanceIds) {
    describe "service registry instance IDs"
    dumpCollection(instanceIds)
  }

  public static void dumpRegistryServiceTypes(Collection<String> entries) {
    describe "service registry types"
    dumpCollection(entries)
  }

  def static void dumpCollection(Collection entries) {
    log.info("number of entries: ${entries.size()}")
    entries.each { log.info(it.toString()) }
  }

  def static void dumpArray(Object[] entries) {
    log.info("number of entries: ${entries.length}")
    entries.each { log.info(it.toString()) }
  }

  public static void dumpMap(Map map) {
    map.entrySet().each { Map.Entry it ->
      log.info("\"${it.key.toString()}\": \"${it.value.toString()}\"")
    }
  }

  /**
   * Get a time option in seconds if set, otherwise the default value (also in seconds).
   * This operation picks up the time value as a system property if set -that
   * value overrides anything in the test file
   * @param conf
   * @param key
   * @param defVal
   * @return
   */
  public static int getTimeOptionMillis(
      Configuration conf,
      String key,
      int defValMillis) {
    int val = conf.getInt(key, 0)
    val = Integer.getInteger(key, val)
    int time = 1000 * val
    if (time == 0) {
      time = defValMillis
    }
    return time;
  }

  def dumpConfigurationSet(PublishedConfigSet confSet) {
    confSet.keys().each { String key ->
      def config = confSet.get(key)
      log.info "$key -- ${config.description}"
    }
  }

  /**
   * Kill any java process with the given grep pattern
   * @param grepString string to grep for
   */
  public int killJavaProcesses(String grepString, int signal) {

    def commandString
    if (!Shell.WINDOWS) {
      GString killCommand = "jps -l| grep ${grepString} | awk '{print \$1}' | xargs kill $signal"
      log.info("Command command = $killCommand")

      commandString = ["bash", "-c", killCommand]
    } else {
      /*
      "jps -l | grep "String" | awk "{print $1}" | xargs -n 1 taskkill /PID"
       */
      GString killCommand = "\"jps -l | grep \"${grepString}\" | gawk \"{print \$1}\" | xargs -n 1 taskkill /f /PID\""
      commandString = ["CMD", "/C", killCommand]
    }
    Process command = commandString.execute()
    def exitCode = command.waitFor()

    log.info(command.in.text)
    log.error(command.err.text)
    return exitCode
  }

  /**
   * Kill all processes which match one of the list of grepstrings
   * @param greps
   * @param signal
   */
  public void killJavaProcesses(List<String> greps, int signal) {
    for (String grep : greps) {
      killJavaProcesses(grep, signal)
    }
  }

  /**
   * Convert a file to a URI suitable for use in an argument
   * @param file file
   * @return a URI string valid on all platforms
   */
  public String toURIArg(File file) {
    file.absoluteFile.toURI().toString()
  }

  /**
   * Assert a file exists; fails with a listing of the parent dir
   * @param text text for front of message
   * @param file file to look for
   * @throws FileNotFoundException
   */
  public void assertFileExists(String text, File file) {
    if (!file.exists()) {
      def parent = file.parentFile
      def files = parent.list()
      StringBuilder builder = new StringBuilder()
      builder.append("${parent.absolutePath}:\n")
      files.each { String name -> builder.append("  $name\n") }
      throw new FileNotFoundException("$text: $file not found in $builder")
    }
  }

  /**
   * Repeat a probe until it succeeds, if it does not execute a failure
   * closure then raise an exception with the supplied message
   * @param probe probe
   * @param timeout time in millis before giving up
   * @param sleepDur sleep between failing attempts
   * @param args map of arguments to the probe
   * @param failIfUnsuccessful if the probe fails after all the attempts
   * —should it raise an exception
   * @param failureMessage message to include in exception raised
   * @param failureHandler closure to invoke prior to the failure being raised
   */
  protected void repeatUntilSuccess(
      String action,
      Closure probe,
      int timeout,
      int sleepDur,
      Map args,
      boolean failIfUnsuccessful,
      String failureMessage,
      Closure failureHandler) {
    log.debug("Probe $action timelimit $timeout")
    if (timeout < 1000) {
      fail("Timeout $timeout too low: milliseconds are expected, not seconds")
    }
    int attemptCount = 0
    boolean succeeded = false;
    boolean completed = false;
    Duration duration = new Duration(timeout)
    duration.start();
    while (!completed) {
      Outcome outcome = (Outcome) probe(args)
      if (outcome.equals(Outcome.Success)) {
        // success
        log.debug("Success after $attemptCount attempt(s)")
        succeeded = true;
        completed = true;
      } else if (outcome.equals(Outcome.Retry)) {
        // failed but retry possible
        attemptCount++;
        completed = duration.limitExceeded
        if (!completed) {
          log.debug("Attempt $attemptCount failed")
          sleep(sleepDur)
        }
      } else if (outcome.equals(Outcome.Fail)) {
        // fast fail
        log.debug("Fast fail of probe")
        completed = true;
      }
    }
    if (!succeeded) {
      if (duration.limitExceeded) {
        log.info("probe timed out after $timeout and $attemptCount attempts")
      }
      if (failureHandler) {
        failureHandler()
      }
      if (failIfUnsuccessful) {
        fail(failureMessage)
      }
    }
  }

}